The GitHub Actions job "Required Checks" on 
texera.git/release/v1.1.0-incubating has failed.
Run started by GitHub user Yicong-Huang (triggered by Yicong-Huang).

Head commit for run:
c71dae2d7d090348c687f0b5eb416a52ac251edb / Yicong Huang 
<[email protected]>
docs: add Codecov coverage badge to README (#4714)

### What changes were proposed in this PR?

Add a Codecov coverage badge to the existing `<p align="center">` stats
block in `README.md`. The badge links to
https://app.codecov.io/gh/apache/texera so reviewers / contributors can
see the current overall coverage and click through to the per-flag
breakdown without leaving the repo home page.

```diff
   <img alt="Static Badge" 
src="https://img.shields.io/badge/Largest_Deployment-100_nodes,_400_cores-green";>
+  <a href="https://app.codecov.io/gh/apache/texera";><img alt="Coverage" 
src="https://img.shields.io/codecov/c/github/apache/texera/main?logo=codecov&label=coverage";></a>
 </p>
```

Why now: PR #4666 wired `CODECOV_TOKEN` so push events on `main` and
`release/**` now upload coverage. The latest few main commits at
`https://codecov.io/api/v2/github/apache/repos/texera/branches/main` are
reporting `46%` overall (frontend / scala / python / agent-service flags
broken out). Without the badge, every "what's the current coverage?"
question is a manual hop to the Codecov dashboard.

Style note: shields.io to match the neighboring `Static Badge` images.
Linked so a click jumps straight to the dashboard (the existing badges
are images-only).

### Any related issues, documentation, discussions?

Closes #4713. Related: #4666 (Phase 2 token wiring), #4645 (Phase 1
tokenless wiring).

### How was this PR tested?

This is a one-line README change; rendered the new line in the GitHub
markdown preview locally. The badge URL is already producing a
non-`unknown` value (the dashboard returns `46%` for the latest main
commits), so the rendered badge will be a real number on first view, not
the placeholder.

### Was this PR authored or co-authored using generative AI tooling?

Generated-by: Claude Code (Opus 4.7, 1M context)

Co-authored-by: Claude Opus 4.7 (1M context) <[email protected]>

(backported from commit 09715e1c46086ecee3feee496c20846e0ca801ae)

Report URL: https://github.com/apache/texera/actions/runs/25265705349

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